Column Subtraction7.0 - App Store

Column Subtraction helps students learn and practice the column subtraction method step by step.

The app aligns the numbers automatically so students can focus on solving each column. Renaming is animated visually, helping students understand how values are moved between columns. Renaming can be done automatically or manually, and renaming over several columns is supported.

Students can solve randomly generated problems or enter their own subtraction problems. The number of digits can be adjusted, making the app useful for different skill levels.

Column subtraction is also known as columnar subtraction, long subtraction, or longhand subtraction. Renaming is also known as regrouping, trading, or borrowing.

Features:

- Subtract 2 or 3 numbers
- Each number can have 1-5 digits
- Randomly generated or manually entered problems
- Automatic number alignment
- Manual or automatic renaming/regrouping
- Supports renaming over several columns
- Current operation for each column can be hidden
- Operands of the current operation can be highlighted
- Adjustable animation speed
- Different interfaces for iPhone and iPad
- 25 six-piece animal jigsaw puzzles
- Puzzle feature can be turned on or off

Reviews and Endorsements:

Professor Tim Pelton, assistant professor of Mathematics Education at the University of Victoria:
“If your goal is to help your child to master the traditional subtraction algorithm then Column Subtraction may be the ideal App.”

“With the ‘show current operation’ option turned on, they are constantly reminded of the next step, which can lead to efficient practice of the procedure. Then by turning off the current operation your child is able to practice remembering the steps on his/her own.”

Teacher endorsement:

“The Math apps by Esa Helttula allow students to practice and reinforce the specific computation strategies taught in class, with as much or as little scaffolding as necessary. They also provide individualized feedback to each student, with an immediacy that is not always possible through pencil and paper practice.”
- Rita Zeni, Ecole Sandy Hill Elementary, Abbotsford, BC, Canada

Other iDevBooks Math Apps:

Other iDevBooks math apps include Column Addition, Long Division, Long Multiplication, Lattice Multiplication, Visual Multiplication Table, Fraction Math, Partial Differences Subtraction, Partial Quotients Division, Partial Sums Addition, and more.

Feedback:

New ideas to make this app better are welcome. Please visit idevbooks.com to give feedback.

Privacy:

This app has no ads, no in-app purchases, and does not transmit user data during operation. The app also does not contain links to other apps or to the web.

Version History Updated for iOS 26 compatibility. 7.0 May 29 - support for iOS 15 6.5 09/28/2021 - support for iOS 14 6.2 04/01/2021 Picture puzzle rewards that were missing from version 6.0 are now back. 6.1 10/07/2019 - support for iOS 13
- new interface with support for latest iPad and iPhone models
- new theme colors 6.0 09/30/2019 - support for iOS 12
- support for iPhone Xr and Xs Max
- minor bug fixes 5.2 11/12/2018 - suport for iPhone X
- support for iOS 11
- minor bug fixes 5.1 03/19/2018 - open worksheets from app (new worksheets can be made on the iDevBooks.com site)
- support for iOS 10.0
- support for shared iPad in school environments

For more information about worksheets and other new features of this version please visit idevbooks.com. Please also get in contact if you have any feedback or you want information about 32 iDevBooks math apps. 5.0 02/15/2017 - support for iOS 9.3

Please visit iDevBooks.com if you have any feedback or you want information about 26 iDevBooks math apps. 4.0 04/05/2016 - minor interface changes
- new icon 3.0 09/12/2014 Interface updates for iOS 7.

If you have any feedback please visit idevbooks.com. There are now 25 iDevBooks math apps. 2.5 09/29/2013 New features that were requested by a teacher:
- Renaming can now be done manually or automatically
- The term to use for renaming can now also be 'trading' or 'regrouping' in addition to 'renaming' and 'borrowing'.

There are also some minor bug fixes.

If you have any feedback please visit idevbooks.com. There are now 23 iDevBooks math apps. 2.4 02/28/2013 Fixes a problem with the puzzle pieces on the iPad. Some pieces were not visible in landscape orientation.

If you have any feedback please visit idevbooks.com. There are now 20 iDevBooks math apps. 2.3 11/20/2012 Support for iPhone 5 and iOS 6.

Please visit http://idevbooks.com if you have any questions or feedback. 2.2 10/04/2012 - New setting to select the regrouping term (borrow or trade)
- Minor bug fixes
- Retina graphics for the new iPad

Please visit http://idevbooks.com to give feedback or browse 18 other math apps. 2.1 08/29/2012 - The app is now universal and it has custom interfaces for iPhone and iPad
- On the iPad the app can be used in portrait or landscape orientation
- Some minor bugs on iPhone / iPod Touch have been fixed
- Retina resolution graphics for iPhone 4, iPhone 4s, and iPod Touch 4G/5G have been added
- Please give feedback and get information about 18 other math apps by visiting http://idevbooks.com 2.0 12/02/2011 Some interface changes.

If you have any questions, requests for new features or would like to see my 18 other math apps please visit http://idevbooks.com 1.5 08/03/2011 -You can now set you own problems
-25 different 6-piece jigsaw puzzles
-Ability to show or hide the puzzles
-Numbers can have 1-5 digits (previously 2-5)
-Support for fast app switching in iOS 4
-Hi-res pictures for iPhone 4 Retina Display
-New icon that is similar in style as icons of my other apps: Column Addition, Long Division, Long Multiplication etc.
-Minor bug fixes

If you have any questions, requests for new features or would like to see my 17 other math apps please visit http://idevbooks.com 1.4 08/18/2010 - The preview in the settings did not always update correctly
- In the subtraction of three numbers there are now two minus signs
- Other minor changes

Some of the changes in this update are based on customer feedback. If you have any feature requests or other issues, please contact me at http://idevbooks.com. Consider also writing a review at iTunes. 1.3 03/04/2010 New features:

-The speed of the animations can be set
-The current operands can be highlighted
-The app has now 3 different color themes
-All settings are saved when you exit the app
-The app has a web link to support pages at idevbooks.com

Thank you for using this app. My other apps — column addition and long multiplication — have also been updated. Please get in touch if you have any questions or feedback. 1.2 01/06/2010 1.0 12/08/2009